Ntt Docomo, Inc.

Masaaki Ohtake

Hideaki Takahashi

Wuri Andarmawanti Hapsari

Kohei Kiyoshima

Yasuhiro Kawabe

Takahiro Takiguchi

A user apparatus configured to perform communication with a base station in a mobile communication system that supports carrier aggregation, including: transmission means configured to transmit, to the base station, the number of layers for each of component carriers that form the carrier aggregation as information of downlink MIMO capability; and reception means configured to receive, from the base station, the number of layers that is used for determining a bit width of a rank indicator for each of the component carriers that form the carrier aggregation.

User apparatus, base station and information reception method

A base station includes a transceiver and a processor. The processor is configured to: in response to receiving a connection request from user equipment, causes a transceiver to transmit a message to a first management apparatus; and in response to receiving a reroute message to indicate a reroute from a first management apparatus to a second management apparatus, causes the transceiver to transmit Non Access Stratum (NAS) information in the reroute message to the second management apparatus. The message includes an identifier of the user equipment assigned by the base station. The base station is configured to perform a connection operation on the user equipment. The identifier of the user equipment assigned by the base station is configured in the reroute message without provision of an identifier of the user equipment assigned by the first management apparatus.

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Tokyo, Japan

Masaaki Ohtake